It supports iOS 5/6/7. All GSM iPhone 4S will have FULL Calls/SMS/3G OK but SPRINT (all CDMA) will have Calls/SMS/3G OK for cut-sim, EDGE for un-cut SIM

It comes with its NEW own interface, that is very simple and easy to use. All you need to do is insert R-SIM AIR into your iPhone 4S and Select your Carrier from R-SIM AIR Auto-menu or go to Settings > Phone > SIM Application and add the 7 digits IMSI of your iPhone carrier from the list below then restart.